Peter Ajello once lived on a diet that consisted almost entirely of fast-food. He tipped the scales at 450 lbs, but after suffering a stroke, decided to make a lifestyle and diet change.

Peter cut out junk food, BUT: "Every time his will power started to fade he would treat himself to a small square of rich, dark chocolate -- just enough to satisfy his sweet cravings."

The pounds quickly came off and his friends even bet him $15,000 that he couldn't lose 100 lbs in five months. (They were wrong -- he did it.) They even tried to sabotage his diet during the last month:

They even hid jam doughnuts in my gym bag -- but I was so determined, I threw them straight in the bin... On Christmas day, my family sat round the table eating delicious food. I set up a treadmill in the basement and pounded away all day.

In a total of sixteen months, Peter lost over 200 lbs. You can check out Peter's website to read more about his amazing story.